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ok, resampling and converting to mono no works 

git-svn-id: https://svn.musicpd.org/mpd/trunk@2309 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Warren Dukes 2004-10-23 02:40:03 +00:00
parent 12597322a2
commit 480023201a
1 changed files with 41 additions and 27 deletions
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40
src/pcm_utils.c
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@ -242,18 +242,30 @@ void pcm_convertAudioFormat(AudioFormat * inFormat, char * inBuffer, size_t
else {
/* only works if outFormat is 16-bit stereo! */
/* resampling code blatantly ripped from ESD */
mpd_sint32 rd_dat = 0;
mpd_uint32 rd_dat = 0;
mpd_uint32 wr_dat = 0;
mpd_sint16 lsample, rsample;
register mpd_sint16 * out = (mpd_sint16 *)outBuffer;
register mpd_sint16 * in = (mpd_sint16 *)dataChannelConv;
const int shift = sizeof(mpd_sint16);
mpd_uint32 nlen = ((( dataChannelLen >> shift) *
mpd_sint16 * out = (mpd_sint16 *)outBuffer;
mpd_sint16 * in = (mpd_sint16 *)dataChannelConv;
const int shift = sizeof(mpd_sint16)*outFormat->channels;
mpd_uint32 nlen = ((( dataChannelLen / shift) *
(mpd_uint32)(outFormat->sampleRate)) /
inFormat->sampleRate);
nlen <<= shift;
nlen *= outFormat->channels;
while( wr_dat < nlen / shift) {
switch(outFormat->channels) {
case 1:
while( wr_dat < nlen) {
rd_dat = wr_dat * inFormat->sampleRate /
outFormat->sampleRate;
lsample = in[ rd_dat++ ];
out[ wr_dat++ ] = lsample;
}
break;
case 2:
while( wr_dat < nlen) {
rd_dat = wr_dat * inFormat->sampleRate /
outFormat->sampleRate;
rd_dat &= ~1;
@ -264,6 +276,8 @@ void pcm_convertAudioFormat(AudioFormat * inFormat, char * inBuffer, size_t
out[ wr_dat++ ] = lsample;
out[ wr_dat++ ] = rsample;
}
break;
}
}
return;
@ -272,7 +286,7 @@ void pcm_convertAudioFormat(AudioFormat * inFormat, char * inBuffer, size_t
size_t pcm_sizeOfOutputBufferForAudioFormatConversion(AudioFormat * inFormat,
size_t inSize, AudioFormat * outFormat)
{
const int shift = sizeof(mpd_sint16);
const int shift = sizeof(mpd_sint16)*outFormat->channels;
size_t outSize = inSize;
switch(inFormat->bits) {
@ -286,21 +300,21 @@ size_t pcm_sizeOfOutputBufferForAudioFormatConversion(AudioFormat * inFormat,
exit(EXIT_FAILURE);
}
if(inFormat->channels != outFormat->channels) {
switch(inFormat->channels) {
case 1:
outSize = (outSize >> 1) << 2;
break;
case 2:
//outSize >>= 1;
break;
default:
ERROR("only 1 or 2 channels are supported for conversion!\n");
exit(EXIT_FAILURE);
}
}
outSize = (((outSize >> shift) * (mpd_uint32)(outFormat->sampleRate)) /
outSize = (((outSize / shift) * (mpd_uint32)(outFormat->sampleRate)) /
inFormat->sampleRate);
outSize <<= shift;
outSize *= shift;
return outSize;
}